Discharge lamp and illumination apparatus

Inactive Publication Date: 2006-09-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] According to the above-mentioned discharge lamp of the present invention, since luminous efficiency of the discharge lamp can be improved, power consumption can be decreased and brightness can be increased.
[0021] Also, the diameter of the discharge lamp can be decreased.
[0022] Furthe

Problems solved by technology

However, since the related-art hot cathode type discharge lamp is as large as about 20 mm in diameter, it is not suitable for the application as a backlight of a liquid-crystal

Method used

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  • Discharge lamp and illumination apparatus
  • Discharge lamp and illumination apparatus
  • Discharge lamp and illumination apparatus

Examples

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Example

[0027] The present invention will now be described in detail with reference to the drawings.

[0028]FIG. 1 of the accompanying drawings is a schematic diagram showing an arrangement of a discharge lamp according to an embodiment of the present invention.

[0029] A discharge lamp, generally depicted by reference numeral 1 in FIG. 1, includes a long and narrow glass tube 2 with electrodes 3 attached to its respective end portions, and two lead wires (lead-in wires) are connected to the two electrodes 3.

[0030] As shown in FIG. 1, a fluorescent substance layer 2A (also see FIG. 2) is formed on the inner surface of the glass tube 2.

[0031] Also, the glass tube 2 has a rare gas such as argon (Ar) gas and mercury (Hg) serving as a luminescent material sealed into the inside thereof.

[0032]FIG. 2 is a diagram showing components provided near the electrode 3 at the left end portion of the discharge lamp 1 shown in FIG. 1 in an enlarged-scale;

[0033] As shown in FIG. 2, the electrode 3 include...

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Abstract

A discharge lamp (1) includes a glass tube (2) having electrodes (3) with an electron radioactive material coated thereon, the electrodes (3) being provided on respective ends of the glass tube (2), wherein the glass tube (2) has a gas containing a luminescent material sealed therein and has a fluorescent material coated on its inner surface, the glass tube (2) has a diameter less than 6.5 mm and the gas sealed into the glass tube (2) is gases of more than one kind selected from an Ar (argon) gas, a Kr (krypton) gas and a Xe (xenon) gas or a mixed gas mainly made of gases of more than one kind selected from the Ar gas, the Kr gas and the Xe gas. Thus, the discharge lamp (1) can reduce a diameter of its tube and it is able to provide high luminous efficiency.

Description

CROSS REFERENCES TO RELATED APPLICATIONS [0001] The present invention contains subject matter related to Japanese Patent Application JP 2005-087101 filed in the Japanese Patent Office on Mar. 24, 2005, the entire contents of which being incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a discharge lamp such as a hot cathode type discharge lamp and an illumination apparatus including a discharge lamp. [0004] 2. Description of the Related Art [0005] It has been customary to use a discharge lamp using a fluorescent substance as a light source. [0006] As a discharge lamp using a fluorescent substance, there are enumerated a hot cathode type discharge lamp and a cold cathode type discharge lamp. [0007] A hot cathode type discharge lamp has an arrangement in which electrodes having a filament or a coil are provided at respective end portions of a glass tube, a gas such as argon gas and mercury being occlu...

Claims

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Application Information

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IPC IPC(8): H01J61/12H01J61/00H01J61/16H01J61/72
CPCH01J61/16H01J61/20H01J61/067
Inventor HARA, YUKIO
Owner SONY CORP
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